SOLUTION: A long distant runner does a first lap around a track in exactly 50 seconds. As she tires each subsequent lap takes 20% longer than the previous ones. How long does she take to r

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Question 1023834: A long distant runner does a first lap around a track in exactly 50 seconds. As she tires each subsequent lap takes
20% longer than the previous ones. How long does she take to run 3 laps.
Found 2 solutions by ikleyn, MathTherapy:
Answer by ikleyn(52756)   (Show Source): You can put this solution on YOUR website!
.
A long distant runner does a first lap around a track in exactly 50 seconds. As she tires each subsequent lap takes
20% longer than the previous ones. How long does she take to run 3 laps.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

50 + 60 + 72 = 182 seconds.


Answer by MathTherapy(10549)   (Show Source): You can put this solution on YOUR website!

A long distant runner does a first lap around a track in exactly 50 seconds. As she tires each subsequent lap takes
20% longer than the previous ones. How long does she take to run 3 laps. 
Time of 1st lap: 50 seconds

Time of 2nd lap: 1.2(50), or 60 seconds

Time of 3rd lap: 1.2(60), or 72 seconds

Total time to run 3 laps:  

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